Spontaneous vitrification in the Au–Ta system with a small size difference

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Abstract
Spontaneous vitrification was observed in the Au–Ta system, although the atomic size difference between Au and Ta is very small. It was found that among the various compositions studied, vitrification was only achieved at a composition of around Au23Ta77. Comparative data were obtained by ion mixing of Au–Ta multilayered films to support the spontaneous vitrification results. The amorphization mechanism was discussed in terms of competition between the amorphous phase against the nucleation and growth of the existing equilibrium compound, which explained the favorable composition range as well as the thermal stability of the obtained amorphous alloy.

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